/Engine/Plugins/EnhancedInput/Source/EnhancedInput/Public/UserSettings/EnhancedInputUserSettings.h
Synchronously save the settings to a hardcoded save game slot. This will work for simple games, but if you need to integrate it into an advanced save system you should Serialize this object out with the rest of your save data.
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(BlueprintCallable, Category="Enhanced Input|User Settings") virtual void SaveSettings()